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Finding the Fourth Proportional to 428,000.40, 642,000.60 and 322,246.80

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Solution

The fourth proportional to 428,000.40, 642,000.60 and 322,246.80 is: 483,370.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,000.40 : 642,000.60 = 322,246.80 : x
  2. Step 2: Convert to fraction form
    428,000.40/642,000.60 = 322,246.80/x
  3. Step 3: Cross multiply
    428,000.40x = 642,000.60 × 322,246.80
  4. Step 4: Simplify right side
    428,000.40x = 206,882,638,948.08
  5. Step 5: Solve for x
    x = 206,882,638,948.08/428,000.40
  6. Step 6: Final answer
    x = 483,370.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.